The Research On Heat Pump Performance Which Use The Tail Water of Middle-Deep Geothermal Heating

In order to improve the COP of middle-deep geothermal heating system, the research was conducted to analysis the performance and COP of the heat pumps which use the geothermal tail water (10℃~40℃) after the cascade utilization of the middle-deep geothermal heating system as the heat source. The results show that:The COP of the high-temperature heat pump when the heat source inlet water temperature is 38℃ is increased by more than 40% compared with that of the ordinary heat pump when the heat source inlet water temperature is 18℃；Comparing the system COP of three different equipment configuration schemes of ordinary heat pump, high temperature heat pump + ordinary heat pump, two-stage high temperature heat pump + ordinary heat pump, it is concluded that the energy efficiency of the two-stage high temperature heat pump + ordinary heat pump is 20% higher than that of the ordinary heat pump system. The results may provide optimization recommendations for engineering design.